Have you heard of these water-powered clocks by Bedol yet? They require no batteries or electricity to run—just tap water. (Proprietary plates inside the water reservoir allow ions in the water to be turned into current that powers the clock.) It's such a brilliant design. The water only needs to be changed every 6 months! The only teeny-tiny complaint we have is aesthetic. If they could just come out with some better-looking clocks (ahem, like this one by Furni Creations, below), we'd buy them by the case!